20681953263 has 8 divisors (see below), whose sum is σ = 30639930800. Its totient is φ = 13787968824.

The previous prime is 20681953247. The next prime is 20681953267. The reversal of 20681953263 is 36235918602.

It is not a de Polignac number, because 20681953263 - 2⁴ = 20681953247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681953267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382999108 + ... + 382999161.

It is an arithmetic number, because the mean of its divisors is an integer number (3829991350).

Almost surely, 2^20681953263 is an apocalyptic number.

20681953263 is a deficient number, since it is larger than the sum of its proper divisors (9957977537).

20681953263 is an equidigital number, since it uses as much as digits as its factorization.

20681953263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765998278 (or 765998272 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 20681953263 in words is "twenty billion, six hundred eighty-one million, nine hundred fifty-three thousand, two hundred sixty-three".